Fishing tool



July 12, 1938.

'A. H. NEILSON FISHING TOOL Original Filed March 9, 1936 wwf@ PatentedJuly 12, 1938 UNITED STATES? 2,123,791 FISHING ".ro'oi.

Albert H. Neilson,` Tulsa, Okla.

Original alllli'cat.

67,983, 1,),ividdV and on March Si, 1936, Seriallv No'.

this agpplication Septeiber 23, 1936,v Se'ialNo. 102,229

3 Claims.

This invention relates to improvements in fishing tools such as arecommonly used in catching lost sucker rods and the like from deep wells,and its object is as follows:

To provide a iishing tool having a split ring which is so expansible andcontractible within a suitably provided recess in the barrel as to catcha pin or box, said ring, although non-reversible, actually reducing thecost of purchase and maintainance of the socket because its utmostsimplicity enables providing a relatively large number of sizes(internal diameter sizes) to suit as many sizes of pins and boxes.

In the drawing:-

Figure 1 is a longitudinal section of the split ring type of fishingtool illustrating the approach of the tool toward the box of a lostsucker rod.

Figures 2, 3 and 4 are detail sectional views illustrating successiveacts during the catching and gripping of the box.

Figure 5 is a cross section taken on the line 5 5 of Figure 1.

Figure 6 is a cross section taken on the line 6-6 of Figure 1.

Figure '7 is a section similar to Figure 6, but illustrating the use ofa slip ring with a smaller internal diameter.

This application is a division of an application for patent for fishingtool iled by Albert H. Neilson March 9, 1936, Serial No. 67,983, nowPatent No. 2,096,525. Further, it is a direct improvement on the shingtools or rod suckers of A. H. Neilson disclosed in Patents 1,382,602 ofJune 21, 1921 and 1,433,146 of Oct. 24, 1922. Each of these 35 patentsis largely concerned with a slip of that design which will enable thecatching of more than one size of pin, box or pipe.

Modern oil well engineering has developed much harder pins and boxes forsucker rod couplings, so that slips of the types in the patents withmultiple wickers for catching various sizes of pins and boxes, are nolonger as eificient as desired. In other words, the metal of the modernpins and boxes is made so hard that it is diilicult to make multiplewickers bite deeply enough to obtain an effective hold.

The foregoing circumstance has brought with it the virtual necessity ofrequiring a slipfor every size of pin and box to be fished, but thisnecessity l which make it possible to catch a multitude of sizes offittings. This statement should be qualified by the explanation that itis not the one size of ring shown that enables catching the mul- 55titude of sizes of fittings, but rather that the ring is relieved by theprovisions described below is so simple and cheap that a large stock ofsizes can be kept on hand and so equip the tool here shown for themultiple fishing mentioned.

Attention is directed to the drawing. The entrance bore 6a adjacent tothe bevelled entrance 2a of the barrel I, terminates in an annularshoulder 'la providing an internal support, but this shoulder is formedby the smallest diameter of an upward flare I 9, which merges into anexpansion and working recess 20. The bore which forms the recess 2U isreduced at the top to form a shoulder 2| after which the normal boreII)a of the barrel continues on up as shown. The spring 5a and a washer|82L serve a purpose presently explained.

The pressure imposed by the spring 5EL upon the washer I8a is directedto a plain sleeve 22. This sleeve supports the washer I8a and it restsupon a ring 23. Said ring has a bevelled entrance 2li, and it is splitat 25. The purpose of the split is to enable expansion in the space 20and contraction in the are I9.

The internal diameter 26 of this ring is subject to variation. In'otherWords, it is intended to furnish numbers of the rings each with adifferent internal diameter, but with the same external diameter. Everychange in internal diameter will suit a diiTerent size of sucker rodfitting. The particular ring in Figs. 1, and 6, is notched at 2l on itsouter periphery to give it a degree of flexibility. When the internaldiameter 26 is made smaller than in Fig. 6 to catch a smaller sizefitting (Fig. 7) the resultingly greater thickness of the ring will makeit necessary to notch the internal periphery at 28 so as not to reducethe desired flexibility.

The operation is readily understood. In Figure l the problem is to catchthe box B of the lost sucker rod S. It is to be understood that the formhere shown is also adapted to catching pins. The ring 23 is initially ina resting position against the shoulder la. The internal diameter 26 isless than the external diameter of the box B. When the latter iscontacted by the ring 23 upon lowering the tool in the direction ofarrow e (Fig. 1), the rst act is to push the ring up into the space 20(Fig. 2). The shoulder 2| stops the ring, but the ring has expandedsuiiiciently to let the box B on through.

As soon as the box passes the ring, the latter immediately movesdownwardly (arrow f, Fig. 3) because the pressure of the spring 5EL uponit is constant. The flare I9 partially closes the ring. The internaldiameter 26 is not yet as small as it was before (Fig. 1) but smallenough to catch the box B when the barrel is raised in the direction ofarrow g (Fig. 4).

As soon as the lower end of the box contacts the ring 23, the latter isforced to its original position at the bottom of the flare I9 (Fig. 4).The split 25 is closed as before, and the ring provides an adequatesupport for the box so that the box must go with the tool.

I claim:

1. A fishing tool comprising a barrel having an annular recess boundedat the top and bottom by inwardly directed shoulders, the recess beingof largest diameter adjacent to the top shoulder and merging into anupward are beginning at the bottom shoulder, a plain split ring situatedin the recess and being limited by either shoulder when moved, a sleeveloose in the barrel and resting on the ring, and a spring imposingpressure on the sleeve.

2. A shing tool comprising a barrel having an annular recess normally ofless height than diameter, bounded at the top and bottom by inwardlydirected shoulders, the recess being of largest diameter adjacent to thetop shoulder and merging into an upward flare beginning at the bottomshoulder, a plain split ring situated in the recess, being of lessheight than the recess and limited by either shoulder when moved, asleeve loose in the barrel and resting on the ring, and a springimposing pressure on the sleeve.

3. A ishing tool comprising a barrel having an annular internal recessnear one end of the barrel, varying in diameter from end to end anddefining confronting stop shoulders, a plain split ring situated in therecess and limited by either shoulder when moved, and means tending tokeep the ring in engagement with one shoulder.

ALBERT H. NEILSON.

